• Background Sensitivity: mutants on a C57BL/6J background exhibit variable anterior and posterior segment abnormalities that are reduced on a mixed C3Hf/HeA and C57BL/LiA background
and are rarely seen in mutants on CAST/Ei, 129S6/SvEvTac, or BALB/cJ background

• 4 of 6 circling heterozygotes display a significantly reduced number of stereocilia in their ampullae relative to wild-type; the other two circlers show a patchy decrease in the number of stereocilia

• in contrast, circling heterozygotes show normal stereocilia in the organ of Corti, saccule and utricle

• non-circling heterozygotes have normal-appearing stereocilia in both auditory and vestibular tissues

• 4 of 6 circling heterozygotes display a significantly reduced number of stereocilia in their ampullae relative to wild-type; the other two circlers show a patchy decrease in the number of stereocilia

• in contrast, circling heterozygotes show normal stereocilia in the organ of Corti, saccule and utricle

• non-circling heterozygotes have normal-appearing stereocilia in both auditory and vestibular tissues